Window Level

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You can adjust the window level based on the entire image or based on a region of interest.

Overall window level Select the Wl tool. Drag to adjust the window level. Window level changes are applied to all images in the series. (To change the window level for an image at any time, hold SHIFT while dragging on the image.)
Region of interest Select the Box WL tool. Click (or tap) and drag to highlight a region of interest. The window level is adjusted to maximize the contrast of the area you selected.

Note
Use presets (side panel) to apply common window levels.